Unicorn Latin Keyboard
Unicorn's default keyboard is Greek. To set a Latin keyboard and font, go to the Edit menu and select the “Change Font” menu item. Change the keyboard from Greek to Latin, then select a Latin font. The Unicode Latin fonts will be marked with green letters.
The Latin keyboard is toggled by typing the escape key twice, or by typing control-G (command-G on a Mac). When the screen is light green, you are using the Latin keyboard; when it is white, you are using the standard keyboard.
The Latin keyboard layout is essentially the standard keyboard. However, you may use the Latin keyboard to add macrons (long marks) or diaeresis marks to vowels.
_ (underscore) macron
+ (plus sign) diaeresis
For example, to write ā, you would first type 'a', then '_', while in the Latin keyboard mode.